Recording performances in perpendicular magnetic patterned media

Asbahi, Mohamed; Moritz, J.; Diény, B.; Gourgon, C.; Perret, C.; Veerdonk, R.J.M. van de

doi:10.1088/0022-3727/43/38/385003

Cited by 8 publications

(5 citation statements)

References 27 publications

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“…This work describes a process that allows for the rearrangement of sub-10-nm particles in a preassembled monolayer and investigates the effect of varying template parameters on the resulting nanoparticle lattice. The achieved long-range ordering and controllable directionality of the nanostructures are useful in applications such as bit-patterned media, − nanophotonics, and chemical sensing …”

Section: Introductionmentioning

confidence: 99%

Directed Self-Assembly of Densely Packed Gold Nanoparticles

et al. 2012

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Directing the self-assembly of sub-10-nm nanoparticles has been challenging because of the simultaneous requirements to achieve a densely packed monolayer and rearrange nanoparticles to assemble within a template. We met both requirements by separating the processes into two steps by first forming a monolayer of gold nanoparticles on a suitable liquid subphase of anisole and then transferring it edgewise onto a silicon substrate with a prepatterned template comprising nanoposts and nanogratings. Doing so resulted in nanoparticles that assembled in commensuration with the template design while exhibiting appreciable template-induced strain. These dense arrays of nanostructures could either be directly applied or used as lithographic masks in applications for light collection, chemical sensing, and data storage.

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Section: Introductionmentioning

confidence: 99%

Directed Self-Assembly of Densely Packed Gold Nanoparticles

et al. 2012

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“…However, when this variation becomes comparable to the colloidal diameter, finite-size effects such as the dislocation of the particles from their desired positions and reorientation of the lattice would occur. These effects can result in dramatic and often unpredictable changes in the physical properties of the system. , To understand these effects in macroscopic colloids, Pieranski , initiated a study of compression-induced structure transitions followed by extensive theoretical and experimental studies by others in both 2D − and 3D − colloidal systems.…”

mentioning

confidence: 99%

“…These effects can result in dramatic and often unpredictable changes in the physical properties of the system. 7,8 To understand these effects in macroscopic colloids, Pieranski 9,10 initiated a study of compression-induced structure transitions followed by extensive theoretical and experimental studies by others in both 2D 9−12 and 3D 13−15 colloidal systems.…”

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confidence: 99%

Template-Induced Structure Transition in Sub-10 nm Self-Assembling Nanoparticles

et al. 2014

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We report on the directed self-assembly of sub-10 nm gold nanoparticles confined within a template comprising channels of gradually varying widths. When the colloidal lattice parameter is mismatched with the channel width, the nanoparticles rearrange and break their natural close-packed ordering, transiting through a range of structural configurations according to the constraints imposed by the channel. While much work has been done in assembling ordered configurations, studies of the transition regime between ordered states have been limited to microparticles under applied compression. Here, with coordinated experiments and Monte Carlo simulations we show that particles transit through a more diverse set of self-assembled configurations than observed for compressed systems. The new insight from this work could lead to the control and design of complex self-assembled patterns other than periodic arrays of ordered particles.

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“…When first moving to 1 Td/in 2 densities, prepatterned substrates (with block copolymer patterning) were still used and achieved SFD/HC and iSFD/HC around 12.5% and 9% respectively [23]. However, at the same time direct milling and etching capabilities of initially continuous magnetic thin films had made significant progress [27], [37]. Depositing the magnetic media layer onto a flat substrate with no limitations in underlayer materials and thickness before applying the actual patterning process was shown to be highly advantageous.…”

Section: Bmentioning

confidence: 99%

Bit-Patterned Magnetic Recording: Theory, Media Fabrication, and Recording Performance

et al. 2015

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Bit Patterned Media (BPM) for magnetic recording provides a route to thermally stable data recording at >1 Tb/in 2 and circumvents many of the challenges associated with extending conventional granular media technology. Instead of recording a bit on an ensemble of random grains, BPM is comprised of a well ordered array of lithographically patterned isolated magnetic islands, each of which stores one bit. Fabrication of BPM is viewed as the greatest challenge for its commercialization. In this article we describe a BPM fabrication method which combines rotary-stage e-beam lithography, directed self-assembly of block copolymers, self-aligned double patterning, nanoimprint lithography, and ion milling to generate BPM based on CoCrPt alloy materials at densities up to 1.6 Td/in 2 (teradot/inch 2 ). This combination of novel fabrication technologies achieves feature sizes of <10 nm, which is significantly smaller than what conventional nanofabrication methods used in semiconductor manufacturing can achieve. In contrast to earlier work which used hexagonal closepacked arrays of round islands, our latest approach creates BPM with rectangular bitcells, which are advantageous for integration of BPM with existing hard disk drive technology. The advantages of rectangular bits are analyzed from a theoretical and modeling point of view, and system integration requirements such as provision of servo patterns, implementation of write synchronization, and providing for a stable head-disk interface are addressed in the context of experimental results. Optimization of magnetic alloy materials for thermal stability, writeability, and tight switching field distribution is discussed, and a new method for growing BPM islands from a specially patterned underlayer -referred to as "templated growth" -is presented. New recording results at 1.6 Td/in 2 (roughly equivalent to 1.3 Tb/in 2 ) demonstrate a raw error rate <10 -2 , which is consistent with the recording system requirements of modern hard drives. Extendibility of BPM to higher densities, and its eventual combination with energy assisted recording are explored.Index Terms-Bit patterned media, hard disk drive, block copolymer, self-assembly, double patterning, e-beam lithography, sequential infiltration synthesis, nanoimprint lithography, templated growth, thermal annealing, Co alloys, magnetic multilayers, interface anisotropy, magnetic recording, write synchronization, prepatterned servo, areal density.

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Recording performances in perpendicular magnetic patterned media

Cited by 8 publications

References 27 publications

Directed Self-Assembly of Densely Packed Gold Nanoparticles

Directed Self-Assembly of Densely Packed Gold Nanoparticles

Template-Induced Structure Transition in Sub-10 nm Self-Assembling Nanoparticles

Bit-Patterned Magnetic Recording: Theory, Media Fabrication, and Recording Performance

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